Single-section crack liquid production contribution rate evaluation method and device based on pressure drop data

Abstract

The embodiment of the invention provides a single-section crack liquid production contribution rate evaluation method and device based on pressure drop data. The method comprises the steps that the reservoir closing pressure of a target well is determined; a reservoir filtration coefficient expression is determined according to the expression of the crack volume reduction amount and the total filtration loss amount; the maximum crack height is determined by solving a crack height equation; the maximum crack width is determined according to the maximum crack height and the reservoir closing pressure, and the average crack width is determined according to the maximum crack width; the crack length is determined according to the reservoir filtration coefficient expression, the maximum crack height and the maximum crack width, and the half crack length is determined; the liquid production amount of a target crack is determined according to the measured crack porosity, the measured formationthickness, the measured crack liquid phase pressure, the measured crack liquid phase viscosity, the measured liquid phase volume coefficient, the measured well bottom pressure, the obtained average crack width and the obtained half crack length; and the contribution rate of the target crack is determined according to the liquid production amount of the target crack and the total liquid productionamount of the well bottom. The liquid production contribution rate of the single-section crack can be accurately evaluated, and the cost is low.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of oil and gas field development, and in particular to a method and equipment for evaluating the liquid production contribution rate of a single-stage fracture based on pressure drop data. Background technique [0002] With the continuous application and technical progress of hydraulic fracturing technology in oilfield development, how to better evaluate the operation effect of hydraulic fracturing has become an important part of hydraulic fracturing verification. Among them, the evaluation of the fluid production contribution of a single fracture under multiple fractures has gradually become an important index for evaluating the operation effect of hydraulic fracturing. [0003] At present, the existing methods for studying the contribution rate of fracture fluid production are mainly: directly measure the total fluid production and the fluid production of each fracture, and calcul...

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Problems solved by technology

However, this method has high operating cost, long cycle and poor practicability.

In addition, monitoring fracture flow by adding tracers is also a method to obtain the contribution rate of fracture fluid production, but there are few types of tracers that have been found and can be applied so far, which cannot meet the requirements of multi-stage fracturing horizontal wells for all fracture flows. Therefore, the flow rate of fractures at all levels cannot be obtained, that is, the contribution rate of fluid production from fractures at all levels cannot be accurately calculated

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